If you need to use topical medication after your grey nails are empty, then you can cut and file the abnormal nails as much as possible, and then apply topical medication or soak the medication, when the abnormal nails are removed, it will be relatively easier for the medication to penetrate inside the nails, and naturally the medication will be more effective. The nail will be cut on both corners, not too short, or the nail will grow out and stick to the flesh, forming an ingrown nail. If you only use oral medication when treating gray nails, cutting or not cutting the empty nails at this time will not affect the whole treatment process. If you want to cut your nails simply because the empty nails are turning out and sticking up, you can cut the empty nails when you wear shoes and socks, or when the shoes squeeze the abnormal nails and cause pressure and discomfort. Generally, it is not necessary to cut off empty gray nails. It is helpful to cut them off when using topical medication.